# US 2019/0170372 A1 · Indoor heat exchanger > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0170372 A1 - Document ID: US20190170372A1 - Status: Published application - Kind: A1 - Application number: 16/091,440 - Filed: 2017-04-03 - Published: 2019-06-06 - Earliest claimed: 2016-04-07 - Assignees: Daikin Industries, Ltd. - Applicants: Daikin Industries, Ltd. - Inventors: Shun Yoshioka; Yoshiyuki Matsumoto; Satoshi Inoue - Web page: https://patentgrep.com/patent/US20190170372A1 ## CPC - F28F 17/005: {Means for draining condensates from heat exchangers, e.g. from evaporators (F28B9/08 takes precedence)} - F24F 1/0063: by the mounting or arrangement of the heat exchangers - F24F 1/0067: by the shape of the heat exchangers or of parts thereof, e.g. of their fins - F24F 13/30: Arrangement or mounting of heat-exchangers - F25B 39/00: Evaporators; Condensers - F28D 1/0471: {the conduits having a non-circular cross-section (F28D1/0473, F28D1/0476, F28D1/0478 take precedence)} - F28F 1/32: the means having portions engaging further tubular elements - F28F 1/325: {Fins with openings} - F24F 1/0047: mounted in the ceiling or at the ceiling - F24F 13/222: {for evacuating condensate} - F28D 2021/0071: {Evaporators} - F28F 1/022: {with multiple channels} - F28F 2215/12: with U-shaped slots for laterally inserting conduits - F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16) - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS - F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general) ## Abstract An indoor heat exchanger reduces an increase in air flow resistance and enables easy discharge of condensed water. A first heat transfer fin and a second heat transfer fin each include a windward main portion formed with a notch that receives a first flat tube and a second flat tube, respectively, and a leeward communication portion located on a side opposite to an open end of the notch. In the first heat exchange portion and the second heat exchange portion, the plurality of first flat tubes and the plurality of second flat tubes in the rows are arranged in a width direction, and the first and second heat exchange portions each have a bent shape with an inner peripheral side on a windward side and an outer peripheral side on a leeward side. ## Claims ### Claim 1 An indoor heat exchanger comprising: a first heat exchange portion comprising a plurality of first flat tubes arranged in rows and a plurality of first heat transfer fins that intersect with the plurality of first flat tubes, wherein the first heat exchange portion exchanges heat between indoor air that flows in a width direction of the plurality of first flat tubes and refrigerant that flows through the plurality of first flat tubes; and a second heat exchange portion comprising a plurality of second flat tubes arranged in rows and a plurality of second heat transfer fins that intersect with the plurality of second flat tubes, wherein the second heat exchange portion exchanges heat between indoor air that flows in a width direction of the plurality of second flat tubes and refrigerant that flows through the plurality of second flat tubes, wherein the plurality of first heat transfer fins and the plurality of second heat transfer fins each comprise a windward main portion formed with a notch that receives the first flat tube and the second flat tube, respectively, and a leeward communication portion located on a side opposite to an open end of the notch, wherein in the first heat exchange portion and the second heat exchange portion, the plurality of first flat tubes and the plurality of second flat tubes in the rows are arranged in the width direction, and the first heat exchange portion and the second heat exchange portion each have a bent shape with an inner peripheral side on a windward side and an outer peripheral side on a leeward side, wherein the first heat exchange portion does not make contact with the second heat exchange portion, wherein a clearance of 2 mm or less is located between leeward edges of the plurality of first heat transfer fins of the first heat exchange portion and the windward main portions of the second heat transfer fins of the second heat exchange portion, and wherein the second flat tubes are positioned windward of windward edges of the plurality of second heat transfer fins by from 0 mm to 2 mm. ### Claim 2 (depends on 1) The indoor heat exchanger according to claim 1, wherein the first heat exchange portion and the second heat exchange portion each have the bent shape so as to surround an indoor fan with the inner peripheral sides, and are disposed such that indoor air discharged from the indoor fan disposed on the inner peripheral side is guided along the width direction of the plurality of first flat tubes and the plurality of second flat tubes to pass between the plurality of first heat transfer fins and between the plurality of second heat transfer fins and reach the outer peripheral side on which the communication portion of the second heat transfer fin is located. ### Claim 3 (depends on 1) The indoor heat exchanger according to claim 1, wherein the plurality of first flat tubes are positioned windward of windward edges of the plurality of first heat transfer fins by 0 mm or more. ### Claim 4 (depends on 3) The indoor heat exchanger according to claim 3, wherein, in the plurality of first flat tubes arranged in rows and the plurality of second flat tubes arranged in rows, a thickness of tube walls at a windward portion located windward is larger than a thickness of tube walls at a side portion located in a row direction of the plurality of first flat tubes and the plurality of second flat tubes. ### Claim at position 5 -7. (canceled) ### Claim 8 (depends on 1) The indoor heat exchanger according to claim 1, wherein the leeward edges of the plurality of first heat transfer fins in the first heat exchange portion extend in a straight line along the clearance in a vertical direction. ### Claim 9 (depends on 1) The indoor heat exchanger according to claim 1, wherein the first heat exchange portion and the second heat exchange portion each have an L-shape, a C-shape, or a rectangular shape when viewed from the row direction of the plurality of first flat tubes and the plurality of second flat tubes.